weeks



A. B. WEEKS;

LIMBKILN.

(No Model.)

No. 310,759. Patented Jan. 1s', 1885.

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ABNER B. VEEKS, OF ROOKLAND, MAINE, ASSIGNOR OF ONE-HALF TO FRANCIS COBB, OF SAME PLAGE.

LIIVIEKILN.

SPECIFICATION forming part of Letters Patent No. 310,759, dated January 13, 1885.

Application filed October 25, 1884. (No model.)

To all whom it may concern:

Be it known that I, ABNER B. WEEKS, of Rockland, in the county of Knox and State of Maine, have invented a new and useful Improvement in Limekilns; and I do hereby declare that the following is a full, clear, and exact description of the same.

My invention relates to furnaces such as are used for limekilns and like purposes where an even and effectual draft is required.

It consists in dividing the ash-pit by a transverse wall or door at a proper distancein rear ofthe front door of the ash-pit, and in forming a draft in the upper part of the chamber between the front and rear doors of the ashpit, whereby the draft is delivered wholly in front of the fuel, and is prevented from rising through the ash-pit. This regulation and direction render it uniform and even, and also prevent the doors from becoming excessively heated.

I have shown the invention in the accompanying drawings, in which- Figure l represents a central vertical section of the kiln, and Fig. 2 a horizont-al section on line a b of Fig. l.

In the drawings, D represents the interior of the stack, the walls of which are represented at E. On each side are fire-chambers F, opening at their inner ends into the stack or flue Where the limestone or other material is to be heated. The outer ends are closed to the atmosphere by doors f. Underneath the fire-chamber are grates G, through which the ashes may fall to the ash-pit H. rlhe outside door ofthe ashpit, is shown ath, and in rear of the ash-pit and separated therefrom a suffi cient distance to allow the passage of the air, is an interior door, 71:. The upper part of the chamber, between the doors h and 7c, is provided with a grate, g. The air-supply to the fuel passes through an opening in the door h, upward through the grate l(/,and into the front part of the tire-chamber F. It thustends to keep cool the door k, against which it directly impinges, and it also tends to cool the upper door, j', by rushing into the space between the door and the fuel. Ordinarily in calcining limestone wood is used as afuel, and the air passes directly through the pile from front to rear, creating a uniform steady draft from one end to the other, without any countercurrents to which the draft would be liable by the air admitted through the grates G. The effect is the same in kind whatever the fuel used. Some heat is saved, being taken up by the air in its passage over the door 7a and through the grate g. The products of combustion are discharged into the chamber or tlue D, and there act upon the stone or other material to be reduced. The steady even draft is especially advantageous in calcining limestone; but the construction is applicable for general purposes.

Having thus described my invention, what I claim is- In combination with the stack, chamber, or fine D, a fire-chamber, F, having a grate, G,

front, an inner door, It, and grate g, all substantially as described.

In testimony whereof' I have signed my name to this specification in the presence oftwo subscribing witnesses.

ABNER B. WEEKS.

Witnesses:

E. l. NORTON, H. N. PIERCE.

and ash-pit H, underneath, and the doorf inr 

